APA (7th ed.) Citation

Delfgaauw, B. (1969). Twentieth-century philosophy. Magi Books.

Chicago Style (17th ed.) Citation

Delfgaauw, Bernard. Twentieth-century Philosophy. Albany, N.Y.: Magi Books, 1969.

MLA (8th ed.) Citation

Delfgaauw, Bernard. Twentieth-century Philosophy. Magi Books, 1969.